Abstract: A coating composition for paper comprising a mineral pigment and a polymer latex prepared by emulsion polymerization of a monomeric mixture comprising an aliphatic conjugated diene monomer, an ethylenically unsaturated carboxylic acid monomer and a monoolefinic monomer in a weight proportion of 24.5-50:0.5-5:45-75 in the presence of a chain transfer agent, characterized in that the chain transfer agent is carbon tetrachloride and an alkylmercaptan in combination.

Abstract: A thermoplastic resin composition with excellent color development which comprises (A) a graft polymer comprising an ethylene-propylene elastomeric polymer and units of at least two kinds of monomers chosen from aromatic vinyl compounds, vinyl cyanide compounds and other copolymerizable monomers grafted thereon, and if necessary, (A') a copolymer comprising units of at least two kinds of monomers chosen from aromatic vinyl compounds, vinyl cyanide compounds and other copolymerizable monomers in an amount of not more than 95% by weight based on the combined weight of the graft polymer (A) and the copolymer (A'), with (B) a methyl methacrylate polymer, the proportion of the combined weight of the graft polymer (A) and the copolymer (A') and the weight of the methyl methacrylate polymer being from 5:95 to 95:5.

Abstract: A process for preparing a copolymer latex by polymerization of at least one aliphatic conjugated diene monomer, at least one ethylenically unsaturated carboxylic acid monomer and at least one monoolefinic monomer copolymerizable with them in a weight proportion of 19.5-80:0.5-10:10-80, characterized in that (a) a mixture of the whole amount of the aliphatic conjugated diene monomer, the whole amount of the ethylenically unsaturated carboxylic acid monomer and a portion of the monoolefinic monomer, the combined amount of them being from 45 to 99% by weight on the basis of the total amount of the starting monomers, is subjected to emulsion polymerization, and (b) after or while the remainder of the monoolefinic monomer in an amount of from 1 to 55% by weight on the basis of the total amount of the starting monomers is added to the reaction mixture, the further emulsion polymerization is carried out.

Abstract: An elastomeric composition having excellent properties such as excellent heat aging characteristics, dimensional stability, processability, fabrication qualities, hydrolytic resistance, yellowing resistance, and weatherability, which comprises(A) a graft polymer of a rubbery copolymer consisting predominantly ethylene-propylene with at least two groups of the monomers selected from an aromatic vinyl compound, an ethylenically unsaturated nitrile and a methacrylic acid ester, and(B) a polymer selected from a thermoplastic polyurethane, an aromatic vinyl-conjugated diene block copolymer, a polyester elastomer and an olefinic elastomer, in the weight ratio of 10:90 to 90:10.

Abstract: In the emulsion polymerization of an .alpha.-alkylstyrene and an unsaturated nitrile copolymerizable therewith in a weight proportion of 70:30 to 80:20 in the presence of a radical initiator, an improved process wherein the monomers are introduced into the reaction system in such a manner that the concentration of the unreacted unsaturated nitrile in the reaction system is not less than 31% by weight to the entire amount of the unreacted monomers in the reaction system at the completion of the introduction of the monomers, whereby a copolymer of the .alpha.-alkylstyrene and the unsaturated nitrile having an excellent thermal resistance is produced with marked decrease in the amount of unreacted monomers.

Abstract: A thermoplastic resin composition excellent in solvent resistance, paintability and moldability which comprises a polycarbonate resin and a conjugated diene rubber copolymer comprising units of a conjugated diene rubber, an aromatic vinyl compound and at least one of vinyl cyanide compounds and optionally hydroxylated alkyl esters of unsaturated carboxylic acids in a weight proportion of 20:80 to 80:20 with a polyamide resin in an amount of 0.1 to 20 parts by weight on the basis of 100 parts by weight of the combined weight of the polycarbonate resin and the conjugated diene rubber copolymer.

Abstract: A thermoplastic resin composition excellent in heat cycle property which comprises 100 parts by weight of a polycarbonate resin blended or not with an ABS type resin in an amount of not more than 95% by weight based on the combined weight of the polycarbonate resin and the ABS type resin and 0.05 to 3.0 parts by weight of an organo-silicon compound.

Abstract: A thermoplastic resin composition with excellent dwelling thermal stability which comprises 100 parts by weight of a resin composition comprising a polymer (A) obtained by polymerization of at least two kinds of monomers selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds and carboxylic acid alkyl esters in the presence of a conjugated diene rubber and a polycarbonate resin (B) in a weight proportion of from 10:90 to 90:10 and 0.05 to 5.0 parts by weight of at least one acid compound (C) chosen from inorganic acids, organic acids and organic acid anhydrides.

Abstract: A thermoplastic resin composition excellent in coating property which comprises (A) at least one of polyamide resins and polyacetal resins, (B) at least one of aromatic monovinyl compound/vinyl cyanide copolymers comprising units of aromatic monovinyl compounds and units of vinyl cyanides in a weight ratio of 60:40 to 80:20 and having an intrinsic viscosity of 0.3 to 1.1 and (C) at least one of conjugated diene rubber/vinyl cyanide graft copolymers comprising units of conjugated diene rubbers in an amount of 5 to 45% by weight based on the weight of the graft copolymers in a weight proportion of the components (A), (B) and (C) being 0.1-10: 5-90: 5-94.9.

Abstract: A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of an .alpha.-alkylstyrene compound of the formula: ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.3 alkyl and R.sub.2 is hydrogen, C.sub.1 -C.sub.3 alkyl or halo(C.sub.1 -C.sub.3)alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the .alpha.-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.

Abstract: A process for preparing a thermoplastic resin having excellent heat resistance, impact resistance and processability, which comprises emulsion polymerization of a mixture comprising a monomeric mixture consisting essentially of an .alpha.-alkylstyrene, methyl methacrylate and an unsaturated nitrile and a diene rubber latex containing particles of 400 to 900 A in particle size in an amount of not less than 30% by weight in the presence of a radical initiator, the weight proportion of the monomeric mixture and the diene rubber latex (solids) being from 60:40 to 95:5.

Abstract: A foamed urethane composites comprising foaming urethane and a covering material and having excellent in thermal aging-resistance, which is obtained by applying to the covering material surface to be contacted with the foamed urethane (A) an organic solvent solution or aqueous emulsion comprising (A-1) at least one of flexible urethane resins, starting materials for preparation of flexible urethane resins and vinyl chloride resins, further applying thereto (B) an organic solvent solution comprising (B-1) a copolymer of a carboxyl group-containing ethylenically unsaturated monomer(s) with an acrylic and/or methacrylic acid ester(s) and (B-2) at least one of blocked isocyanate compounds, poly-N-alkoxymethylmelamine compounds, polyepoxy compounds, polyoxazoline compounds, polydihydrooxazine compounds and reactive polyamide compounds, and then subjecting the coated product to crosslinking under heating.

Abstract: A color developer sheet sensitized in a color developing property on contact with a chromogenic material and improved in the light-resistance of the developed color, which comprises a support sheet and a coating composition comprising an organic color developer and, as a binder, a latex of a copolymer prepared by polymerization of a mixture essentially consisting of about 20 to 70% by weight of one or more aliphatic conjugated diolefin monomers, about 0.5 to 15% by weight of one or more unsaturated carboxylic acid monomers and about 15 to 79.5% by weight of one or more other olefin monomers copolymerizable with them and having a gel content of about 95 to 100% by weight applied onto a surface of the said support sheet to make a color developer layer.

Abstract: A thermoplastic resin composition having a good heat cycle property which comprises (A) a graft polymer comprising a conjugated diene rubber and an aromatic vinyl compound and a vinylic cyanide grafted thereon in a weight proportion of 5-80:15-140, the weight ratio of the aromatic vinyl compound and the vinylic cyanide being 10-90:5-50, (B) a copolymer comprising an aromatic vinyl compound and a vinylic cyanide in a weight ratio of 40:60 to 90:10 and (C) an organo-silicon compound, the weight proportion of the graft polymer (A) and the copolymer (B) being from 5:95 to 95:5 and the amount of the organo-silicon compound (C) being from 0.05 to 3.0 parts by weight to 100 parts by weight of the combined amount of graft polymer (A) and the copolymer (B).

Abstract: A method for preparation of a plated product which comprises electroplating a molded product of a resin composition comprising at least one kind of thermoplastic resin and carbon black having an oil absorption amount of not less than 200 ml/100 g and a surface area of not less than 500 m.sup.2 /g in a weight proportion of 100:3-100 and having an intrinsic volume resistivity of not more than 10.sup.3 .OMEGA..cm without previous electroless plating.

Abstract: A color developer sheet sensitized in a color developing property on contact with a chromogenic material and improved in the light-resistance of the developed color, which comprises a support sheet and a coating composition comprising an organic color developer and, as a binder, a latex of a copolymer prepared by polymerization of a mixture essentially consisting of about 20 to 70% by weight of one or more aliphatic conjugated diolefin monomers, about 0.5 to 15% by weight of one or more unsaturated carboxylic acid monomers and about 15 to 79.5% by weight of one or more other olefin monomers copolymerizable with them and having a gel content of about 95 to 100% by weight applied onto a surface of the said support sheet to make a color developer layer.

Abstract: A process for producing a thermoplastic resin having excellent impact resistance and processability, which comprises polymerizing an aromatic monovinyl monomer and a vinyl cyanide monomer in the presence of an aqueous elastomeric latex, mixing with agitation the resulting copolymer latex with an aromatic monovinyl monomer and a vinyl cyanide monomer in the presence of a polyalkylene oxide and a coagulant to give a stable suspension phase, and polymerizing the mixture, and said thermoplastic resin thus produced, and a composition comprising said thermoplastic resin and a copolymer produced from an aromatic monovinyl monomer and a vinyl cyanide monomer.

Abstract: A composition for paper coating which comprises a pigment and, as a pigment binder, a synthetic copolymer latex comprising about 24.5 to 50 parts by weight of at least one aliphatic conjugated diolefin, about 0.5 to 10 parts by weight of at least one ethylenically unsaturated carboxylic acid and about 40 to 75 parts by weight of at least one monoolefinic monomer copolymerizable with the aliphatic conjugated diolefin and the ethylenically unsaturated carboxylic acid, the synthetic copolymer having a gel content of not more than about 60 % by weight based on the weight of the synthetic copolymer.

Abstract: A copolymer latex comprising 25 to 45 percent by weight of a conjugated diolefinic monomer, 3 to 40 percent by weight of an alkyl ester of unsaturated carboxylic acid, 1 to 5 percent by weight of a hydroxyalkyl-containing unsaturated monomer, 0.5 to 4 percent by weight of an unsaturated carboxylic acid monomer and the remaining percent of an alkenyl aromatic monomer, and a pigmented paper coating composition, which can give a coated paper having excellent properties, such as water resistance, "transferability of multicolor offset printing ink" and blister resistance in case of web offset printing.